[BUG] Multiple processes not cleaned up after finishing agent task

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

I only have 2 instances of Claude Code while making this screenshot. Claude Code gets TOTALLY UNUSABLE and makes my whole computer UNUSABLE. I have to manually kill those processes every ~ 4h to keep working.

Is there a fix to this? It's been MONTHS since I haven't been able to have a fluid experience like OpenCode or even Codex offers.

<img width="1240" height="826" alt="Image" src="https://github.com/user-attachments/assets/71e0a14a-a748-4cbf-8e1f-109d0533bbdb" />

What Should Happen?

Processes should be cleaned up when a task or agent is finished.

Error Messages/Logs

Steps to Reproduce

1. Prompt for coding normally for like ~ 1-2h
2. Eventually get 50 to 100 of processes like this

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.63

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

I'm running Ghostty
My list of CC plugins :

<img width="667" height="265" alt="Image" src="https://github.com/user-attachments/assets/90d1c53f-43c6-4eb0-b47c-36d927b940c3" />